<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
按f12看代码,代码是对的
		<script>
			var a=2 ,b=4;
			var temp;
			temp=a;
			a=b;
			b=temp;
			console.info("a=+a");
				console.info("b=+b");
		</script>
		
	
		
	<body>
	</body>
</html>
